Reverse-plating device for circular-knitting machines



Nov. 6, 1928.

H. BARTH REVERSE PLATING DEVICE FOR CIRCULAR KNITTING MACHINES Filed April 8, 1927 4 Sheets-Sheet M1 In.

fiwm/W? WM Nov. 6, 1928.

H. BARTH REVERSE PLATING DEVICE FOR CIRCULAR KNITTING MACHINES Filed April 1927 4 Sheets-Sheet fnywzfafi 'Nov. 6, 1928. 1,690,268

H. BARTH REVERSE PLATING DEVICE FOR CIRCULAR KNITTING MACHINES Filed April 1.927 4 Sheets-Sheet 3 Nov. 6, 1928.

H. BARTH REVERSE PLATING DEVICE FOR CIRCULAR KNITTING MACHINES Filed April 1927 4 Sheets-Sheet 4 Patented Nov. 6, 1928.

UNITED STATES HANS BABTH, OF DRESDEN, GERMANY.

REVERSE-PLATING DEVICE FOR CIRCULAR-KNITTIN G MACHINES.

Application filed April 8, 1927, Serial No. 182,121, and in Germany April 10, 1926.

This invention relates to a device for producing reverse-plating effects in circular knitting machines, and consists in the provision of reversing sinkers having serrated edges wherewith to support the yarns, means being provided for imparting retrograde movement to said sinkers so as to reverse the relative position of the yarns in the needle head before the loops are formed. 4

The means for retracting the reversing sinkers preferably consist of adjustable guide segments which are controlled by springpressed slides and by bell-cranks which actuate said slides and which are rocked by the patterning cams.

In order to produce reverse-plating in one part of the work while normal plating is carried out in another part, reversing sinkers are used having butts of different heights which are operated independently by segments ar ranged on different levels, the higher butts being notched to admit the lower segment without being afi'ected thereby.

Fig. 1 of the accompanying drawings represents a part section of the head of the machine,

Fig. 2, a plan view of the same,

Fig. 3, a diagrammatic side view illustrating the laying of the'threads,

Fig. 4, the corresponding plan view,

Fig. 5 a sectional view of the sinker-guides,

Fig. 6, a view of the sinkers for the ground work of the fabric.

Figs. 6? and 6', views of the butts of the reversing sinkers,

Fig. 7, a view showing the initial position of the threads on the sinkers,

Figs. 7 and 7", views showing different stages in the reversing process, and I Fig. 7, a view showing the threads re versed. i

For ordinary plated work. the ground thread G and the plating thread P are laid in the needles as shown in Figs. 3 and 4. The threads are fed to the needles from different angles and placed side by side on the sinker edge as shown in Fig. 7 the plating thread being outermost so as to appear on the outside of the loop and on the face of the fabric.

For producin any desired stripes as well as chequered an figured patterning, the position of the threads is reversed in a needle head wherever required while the needles travel through the distance AB in Fig. 3. This causes the plating thread to be worked as ground thread and vice versa, and the knitting will proceed as usual without leaving any loose threads at the back of the fabric.

The reversal is eii'ected by the provision of reversing sinkers having,inste'ad of the plain edge 16 (Fig. 6) a serrated edge 18 (Figs. 7 to 7 The guides for these sinkers are adjusted by the patterning mechanism so as to cause the sinkers to be retracted from their normal path while the needles travel from A to B (Fig. 3). By this movement of the reversing sinkers, the ground thread G is pressed over the plating thread P by the sinker projections, as shown in Figs. 7 and 7, and drops into a notch at the opposite side of the same, as shown in Fig. 7 so as to appear outermost in the loop and on the face of the fabric.

The retracting movement of the reversing sinkers is effected by the backs l of guide segments 3 and 4 which are controlled by slides moving between guide plates 5. The segments are shifted into and out of operative position by springs 10 and by bell-cranks 8 and 9 which latter engage lugs 6 on the slides. The cam shaft which operates the thread guides and which is rotated by means of a ratchet wheel and a pawl 14, is provided with cams 11 and 12 for rocking the bellcrank. The crests 13 of the cams move the sinker guides into operative position and determine the number of courses during which reversal of threads is to take place.

In the arrangement described there are three kinds of sinkers 22, 23 and 24:, shown respectively in Figs. 6, 6 and (3 The sinkers 22 are ordinary sinkers and are employed wherever no reverse-plating is required. The sinkers 23 and 24 are reversingsinkers and are applied to different positions of the needle cylinder in order to allow normally plated fabric to be produced in one part of the work, for instance in the sole or in the heel of a stocking while patterned reverse-plating is carried out in another part, for instance in the top of the foot.

The guide segments 3 and 4 are superimposed on a guide segment 21 which latter operates all the sinkers in the usual manner for sinking the loops. The reversing sinkers are recessed so as to allow of being retracted by the segments 3, 4 without bein obstructed by the segment 21. The butts o the sinkers 22 are below the level of the se ments 3 and 4 and will therefore remain unaffected by the retrograde movements of the latter, and the butts of the sinkers 23 are below the level of the segment 4 so as to allow the sinkers 24 to be operated independently of the sinkers 23. To allow the sinkers 23 to be operated independently of the sinkers 24, the butts of the latter are formed with notches 26 into which the segment 3 is admitted.

I claim 1. In a circular knitting machine, a reverse-plating device comprising reversing sinkers having serrated shoulders wherewith to support the yarn, and means for imparting to said sinkers a movement in opposite direction to the sinking movement so as to reverse the relative positions of the yarns in the needle head before the loop is formed.

2. A structure as claimed in claim 1 wherein the operating means for the reversing sinkers comprise adjustable guide segments aring cams for operating the bell-cranks.

HANS BARTH. 

